The main purpose of this study is to show the consistency of the index compared to a validated pain scale and used routinely in non-sedated children hospitalized in pediatric intensive care units. This study is based on a real-time analysis of the perception of pain in children. It is a critical validation step that could dramatically change the treatment of pediatric patients in intensive care and pediatric intensive care units by facilitating real-time patient management. The caregiver will have the opportunity to fine tune the effective treatment. The validation of this stool will allow the pain measure for children highly sedated or presenting a neuromotor handicap.